如何将列表数据从Activity传递给android中的presenter（MVP）

Question

如何将列表数据从活动传递给演示者。我已经尝试过 activityname.listname 但它得到了 NULL 。我能知道怎么打电话吗？

MainActivity.java

                 public List<AppGrid> arraylist = new ArrayList<AppGrid>();
                 Bundle bundle = getIntent().getExtras();
    if(bundle != null){
        arraylist = bundle.getParcelableArrayList("mylist");
        Toast.makeText(MainActivity.this,"bundle->+"+arraylist,Toast.LENGTH_LONG).show();

        }
 AddFavariteApps();
    }

   private void AddFavariteApps() {
    HeaderItem HeaderInstalledApps = new HeaderItem(0, "Favourite");
    GridItemPresenter1 gridFavouriteApps = new GridItemPresenter1();
    ArrayObjectAdapter FavouriteAppsAdapter = new ArrayObjectAdapter(gridFavouriteApps);
    FavouriteAppsAdapter.add(getString(R.string.installed_apps));
    FavouriteAppsAdapter.add("Add Apps");
    rowsAdapter.add(new ListRow(HeaderInstalledApps, FavouriteAppsAdapter));
}

GridItemPresenter1.java

public class GridItemPresenter1 extends Presenter {
private static Context mContext;
private static int CARD_WIDTH = 313;
private static int CARD_HEIGHT = 176;
String str_App_name;
Drawable str_App_Icon;
MainActivity mMainActivity;

@Override
public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) {
    str_App_name = Constants.shared().getAppName();
    if (((String) item).equalsIgnoreCase("Add Apps")) {
        ((ViewHolder) viewHolder).mCardView.setContentText("Add Apps");
        ((ViewHolder) viewHolder).mCardView.setMainImageDimensions(CARD_WIDTH, CARD_HEIGHT);
        ((ViewHolder) viewHolder).updateCardViewImage1(R.drawable.item_img_add);

    }else {
        if(mMainActivity.arraylist != null) {
            for (int i = 0; i < mMainActivity.arraylist.size(); i++) {
                viewHolder).mCardView.setContentText(mMainActivity.arraylist.get(i).getName());
            }
        }
    }

}

Answer 1

假设您的 List 是一个字符串列表，则使 data 成为一个 ArrayList 并使用

    intent.putStringArrayListExtra("data", data)

这是您需要的代码框架：

声明列表

    private List<String> test;

在适当的地方初始化列表

    test = new ArrayList<String>();

并根据需要添加数据以进行测试。 传递给意图如下：

    Intent intent = getIntent();  
    intent.putStringArrayListExtra("test", (ArrayList<String>) test);

检索数据如下：

    ArrayList<String> test = getIntent().getStringArrayListExtra("test");

希望对您有所帮助。

Answer 2

将您的数组列表作为参数传递给下面的代码。

   public List<AppGrid> arraylist = new ArrayList<AppGrid>();
                     Bundle bundle = getIntent().getExtras();
        if(bundle != null){
            arraylist = bundle.getParcelableArrayList("mylist");
            Toast.makeText(MainActivity.this,"bundle->+"+arraylist,Toast.LENGTH_LONG).show();

            }
     AddFavariteApps();
        }

       private void AddFavariteApps() {
        HeaderItem HeaderInstalledApps = new HeaderItem(0, "Favourite");
        GridItemPresenter1 gridFavouriteApps = new GridItemPresenter1(arraylist); // pass as your arraylist as parameter
        ArrayObjectAdapter FavouriteAppsAdapter = new ArrayObjectAdapter(gridFavouriteApps);
        FavouriteAppsAdapter.add(getString(R.string.installed_apps));
        FavouriteAppsAdapter.add("Add Apps");
        rowsAdapter.add(new ListRow(HeaderInstalledApps, FavouriteAppsAdapter));
    }

================================================ ===========

public class GridItemPresenter1 extends Presenter {
private static Context mContext;
private static int CARD_WIDTH = 313;
private static int CARD_HEIGHT = 176;
String str_App_name;
Drawable str_App_Icon;
MainActivity mMainActivity;

 public GridItemPresenter1 (List<AppGrid> arraylist) {
        this.arraylist = arraylist;
    }

@Override
public void onBindViewHolder(Presenter.ViewHolder viewHolder, Object item) {
    str_App_name = Constants.shared().getAppName();
    if (((String) item).equalsIgnoreCase("Add Apps")) {
        ((ViewHolder) viewHolder).mCardView.setContentText("Add Apps");
        ((ViewHolder) viewHolder).mCardView.setMainImageDimensions(CARD_WIDTH, CARD_HEIGHT);
        ((ViewHolder) viewHolder).updateCardViewImage1(R.drawable.item_img_add);

    }else {
       if(arraylist != null) {
                for (int i = 0; i <arraylist.size(); i++) {
                    viewHolder).mCardView.setContentText(arraylist.get(i).getName());
                }
            }
    }

}